On Thu, 29 Jan 1998 11:53:20 EST5EDT, you wrote:

>> Have anyone designed a one pin interface?
>>
>> It would be nice to have a simple monitor suopport program in every PIC, so
>> if we want to check inside it when it is working (or working wrong) we can
>> attach a specialised unit with a display and keyboard to it. We must use
>> minimum number of pins for it (one), and it should be possible to implement
>> "everywhere".
>>
>> The monitor unit I believe can be built using a F84, LCD and a few keys to
>> select adress and view and change registers, force gotos or calls to
>> stop,test,run routines etc in the target system.
>>
>> The target system's routine shoud of course be as possible as possible, and
>> perform som kind of erroer check so it don't treat noise as instructions.
>>
>> The monitor scans the keys, decode it to simple instructions and send them
>> to the target. The target sends back register contents binary, which the
>> monitor decodes and displays.
>>
>> /Morgan O
>>
>>
>>
>>
>> Morgan Olsson, MORGANS REGLERTEKNIK, Sweden, ph: +46 (0)414 70741; fax 70331
>> -
>Ever heard of an ICE?
Ever heard of poor people?

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